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Microwave PCB

RO4350B Microwave RF Board

Board Thickness: 1.6 mm;

Line Width : 3MIL;

Line Spacing : 3MIL;

Drilling Diameter: =0.2mm;

Number of Layers 2 layers;

Dielectric Constant :2.58;

Loss Factor : 0.0022 (1 MHz), 0.0026 (10 GHz);

Dielectric Thickness: 1.522mm Tg: >280;

Flame Retardant Grade: V-0;

Thermal Conductivity: 0.38w/m.k;

Surface Technology: Immersion gold, gold plating, tin spraying, OSP.


Radio Frequency, abbreviated RF, is short for high frequency alternating changing electromagnetic waves.

Electromagnetic waves are actually the more familiar concept.

According to Maxwell's electromagnetic field theory: an oscillating electric field produces an oscillating magnetic field, and an oscillating magnetic field produces an oscillating electric field.

Electromagnetic fields propagate outward in space, forming electromagnetic waves.

The following diagram can roughly represent this process, E represents the electric field and B represents the magnetic field.

The phase and amplitude of the electric and magnetic fields at the same location on the axis change with time.

Typically, radio frequency (RF) is a collective term for electromagnetic waves with an oscillation frequency between 300KHz and 300 GHz, which are widely used in radar and wireless communications.

a, Basic RF Characteristics

In order to describe a given RF signal, it can be viewed from four perspectives: frequency, wavelength, amplitude, and phase.

b, Frequency and Wavelength

The frequency of an electromagnetic wave is the frequency of the oscillation of the electromagnetic field.

Fluctuations have a period, frequency (f) that is, the number of cycles of a given unit of time the wave occurs, the unit is Hertz (Hz).

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The wavelength (λ), i.e., the distance the wave travels in one cycle, is inversely proportional to the frequency for a given speed of propagation, i.e., λ = c / f.

RFs of similar frequencies can interfere with each other, so there are organizations that specialize in managing the spectrum to allocate the use of frequency bands, avoid mutual interference between applications, and regulate the use of RF.

Due to attenuation and other factors, low-frequency electromagnetic waves can generally travel longer distances than high-frequency electromagnetic waves, so they are often used for over-the-horizon radar.

High-frequency electromagnetic waves, on the other hand, have high energy, strong penetration capability and higher bandwidth, and are now also used for some line-of-sight communications to alleviate the problem of low-frequency band congestion, such as mmWave communications.


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